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Old 09-03-2002, 11:29 AM
Bob Boyer
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W126 AC low pressure line: help!

On my vehicle ('88 420 SEL), apparently, previous owner retrofitted to 134a.

Which would be the low pressure line, so I know where to add refrigerant? I only see a thick line on top of left side of engine compartment, with a blue plastic covered valve. Is this the low pressure line, or is there one below it closer to the compressor?

Thanks.
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Old 09-03-2002, 01:38 PM
jbaj007's Avatar
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Join Date: Jun 2001
Location: Santa Monica, CA
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Blue is LOW; RED is high. You are wise to have double checked, though. Sometimes the previous work will be "different". The thick hose where you describe is the low side. Gauges help a lot when dealing with the A/C (borrow, beg, try Autozone tool loan program).
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